12 
PALAEONTOLOGY OF NEW-YOEK. 
Position and locality. This species occurs in the higher calcareous layers of this rock, at 
several places on the Mohawk ; at Canajoharie ; and also in Lewis and Jefferson counties. 
(State Collection.) 
13. 1. TURBO DILUCULA (». sp.). 
Pl. III. Fig. 7. 
Subglobose ; volutions few (about 3), ventricose, rapidly enlarging to the aperture; 
shell thin ? ; spire moderately elevated, obtuse ; width and height of the shell about equal; 
surface 1 
This fossil occurs in great numbers in the siliceous portions of the rock, usually in the 
form of casts, or the cavities made by the shell only are preserved. The specimen figured, 
with portions of several others, occurs in a coarse siliceous mass, partially decomposed, and 
containing ramified veins of clialcedonic quartz. 
Position and locality. This species is found at Middleville, at the locality of quartz 
crystals ; and also at Littlefalls, Herkimer county. It occurs in the lower and middle parts 
of the mass, and usually in porous or cavernous portions. 
14. 2. TURBO I OBSCURA (n. sp.). 
Pl. III. Fig. 8. 
Subconical; spire ascending, obtuse ; volutions few (3?), tumid, gradually increasing 
from the apex ; height considerably exceeding the width. 
This shell differs from the last in the proportionally greater height, and the more gradual 
enlargement of the volutions from the apex towards the aperture. The specimen figured 
occurs in a calcareous sandstone, with several others, more imperfect, all of which are casts, 
and the surfaces much eroded. 
Position and locality. This shell occurs in the upper portions of the rock, at Fort-Plain. 
15. 1. PLEUROTOMARIA? TURGIDA (n. sp.). 
Pl. III. Figs. 9 and 10. 
Depressed-conical; whorls about 4, tumid, subangular, rapidly increasing from the apex; 
last whorl very large, ventricose, expanded; height and greatest breadth about equal. 
This fossil is a rough cast of chert in a coarse siliceous mass of calcareous sandstone, and 
consequently its characters cannot be very accurately determined. The form of the aperture 
is very similar to that of Natica. In fig. 10, the upper part of the spire is nearly corroded, 
and the whole surface very rough; in fig. 9, the surface is less eroded, though otherwise 
in a similar condition. 
Position and locality. This species was found in a loose cherty mass of the rock in 
Saratoga county. ( Cabinet of Lyman Wildes.) 
